At this point, it doesn't do anything more than mode C.

The assigned mode S code is currently not being programmed into the
transponder, and the controller still doesn't get your tail number
until you give it to him.

Eventually...

On Mon, 19 Apr 2004 21:42:51 -0500, "O. Sami Saydjari"
wrote:

I believe it also provides the controller with your tail number
automatically. -Sami

PaulaJay1 wrote:

Just got the Garmin 330 Mode S transponder installed in my Archer. The traffic
display on the 430 is great. My question is "What does the mode S do for the
controller that the Mode C doesn't?"
Chuck